[srslte-users] UHD Sample Errors

[MATTHEW SUMMERS]

Hi Folks,
I am having problems with both eNB and UE applications interfacing with a B210. I cant seem to nail down what is wrong exactly. Sometimes the UE will get to RRC Connected but invariably I get UHD sample errors, see below, which may or may not be fixed with a reboot of PC/URSP. I cannot get srsenb working at all.
To date I have trawled the mailing list and beyond looking for a solution and nothing has stood out.

-- srsue Errors --
 Attaching UE.../home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error timed out while receiving samples from UHD.SYNC:  Receiving from radio while in IDLE_RXSearching cell in DL EARFCN=6400, f_dl=816.0 MHz, f_ul=857.0 MHz/home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error timed out while receiving samples from UHD.SYNC:  Receiving from radio while in IDLE_RX./home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error timed out while receiving samples from UHD./home/matt/Documents/build/srsLTE/lib/src/phy/ue/ue_sync.c.727: Error receiving samples/home/matt/Documents/build/srsLTE/lib/src/phy/ue/ue_cell_search.c.309: Error calling srslte_ue_sync_work()/home/matt/Documents/build/srsLTE/lib/src/phy/ue/ue_cell_search.c.268: Error searching cell/home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error timed out while receiving samples from UHD.SYNC:  Receiving from radio while in IDLE_RX/home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error timed out while receiving samples from UHD.SYNC:  Receiving from radio while in IDLE_RX/home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error timed out while receiving samples from UHD.SYNC:  Receiving from radio while in IDLE_RX/home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error timed out while receiving samples from UHD.SYNC:  Receiving from radio while in IDLE_RX

 
-- srsenb Errors --
 [ERROR] [STREAMER] The receive packet handler caught a value exception.ValueError: bad vrt header or packet fragment/home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error timed out while receiving samples from UHD./home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error timed out while receiving samples from UHD./home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error timed out while receiving samples from UHD./home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error timed out while receiving samples from UHD./home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error timed out while receiving samples from UHD./home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error timed out while receiving samples from UHD./home/matt/Documents/build/srsLTE/lib/src/phy/rf/rf_uhd_imp.c.845: Error timed out while receiving samples from UHD.

First I tried it on the following:1 - Ubuntu 18 in a VM 2 - srsLTE 19.06 from source and UHD_3.14.1.0-release3 - B210 connected via USB 34 - CPU frequency scaling fixed5 - multi-CPU config with 8GB RAM6 - TX set gain to 89
srsue connecting to a real eNB gives sampling errors ~80% of the time.srsenb never works.....it just errors
So I tried it again on my NUC which has a lot more grunt (i7, 32GB, SSD).
I built 2 more VMs, one with a vanilla apt-get install of UHD (3.14.1.0-release) and srsLTE (19.03) and then I built another from source with srsLTE 19.06 from source and UHD_3.14.1.0-release. I get exactly the same errors on these installs as well.
Anyone have any pointers on where I can try next?
Thanks in advance,
Matt
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